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lim(x->1)sqrt(1-cos2(x-1))/(x-1) a. ex...

`lim_(x->1)sqrt(1-cos2(x-1))/(x-1)`

a. exists and its equals `sqrt(2)`

b. exists and its equals `sqrt(-2)`

c.does not exist because `x-1->0`

d. L.H.L not equal R.H.L

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